linux-kernel - Re: [RFC][PATCH 18/22] sched: add reclaiming logic to -deadline tasks

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Date:	Fri, 12 Nov 2010 20:07:46 +0100
From:	Raistlin <raistlin@...ux.it>
To:	Tommaso Cucinotta <tommaso.cucinotta@...up.it>
Cc:	Luca Abeni <luca.abeni@...tn.it>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Chris Friesen <cfriesen@...tel.com>, oleg@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Darren Hart <darren@...art.com>,
	Johan Eker <johan.eker@...csson.com>,
	"p.faure" <p.faure@...tech.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Claudio Scordino <claudio@...dence.eu.com>,
	michael trimarchi <trimarchi@...is.sssup.it>,
	Fabio Checconi <fabio@...dalf.sssup.it>,
	Tommaso Cucinotta <cucinotta@...up.it>,
	Juri Lelli <juri.lelli@...il.com>,
	Nicola Manica <nicola.manica@...i.unitn.it>,
	Dhaval Giani <dhaval@...is.sssup.it>,
	Harald Gustafsson <hgu1972@...il.com>,
	paulmck <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 18/22] sched: add reclaiming logic to -deadline
 tasks

On Fri, 2010-11-12 at 19:07 +0100, Tommaso Cucinotta wrote:
> Let me underline a few key points, also about the technique suggested by 
> Zijlstra:
>
> [...]
>
> I can see 2 major drawbacks:
>    a) you need to compute the "\psi" in order to use the "Corollary 10" 
> of that paper, but that quantity needs to solve a LP optimization 
> problem (see also the example in Section 6); the \psi can be used in Eq. 
> (36) in order to compute the *expected tardiness*;
>
> [...]
>
Wow man! You really know what "give us details" means, don't you? :-PP

Thanks and regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
----------------------------------------------------------------------
Dario Faggioli, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa  (Italy)

http://blog.linux.it/raistlin / raistlin@...ga.net /
dario.faggioli@...ber.org

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